CORS Misconfiguration in PILOS Platform for Interactive Live-Online Seminars

CVE-2025-62523

What is CVE-2025-62523?

The PILOS platform, designed for interactive webinars using BigBlueButton, has a vulnerability stemming from a misconfigured Cross-Origin Resource Sharing (CORS) in its middleware. In versions before 4.8.0, the platform improperly reflects the Origin request header within the Access-Control-Allow-Origin response header, lacking robust validation or a whitelist. This flaw, combined with the setting of Access-Control-Allow-Credentials to true, could allow an attacker to exploit the API by sending crafted requests from a malicious site. Such exploitation might lead to the potential exfiltration of sensitive information or execution of actions with the victim's credentials, if the server mistakenly considers these cross-origin requests as legitimate. However, it is important to note that due to Laravel's inherent session handling and additional origin checks, this reflected-Origin CORS misconfiguration may not be effortlessly exploitable in standard implementations of PILOS. An important security patch addressing this issue has been released in version 4.8.0.

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